 including those critical undecided voters. After the debate, the president stops by a watch party his campaign organized in Atlanta to meet with supporters. The Biden campaign says they're hosting similar events in all 50 states, and 12,000 people are participating just in the battleground states. Karen Travers, ABC News, Washington. The Transportation Security Administration is predicting that today could be the busiest travel day of the year as Americans head out early for the Fourth of July holiday.